<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/Home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部的警告区域 -->
            <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>
            
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader
                v-model="selectedCateKeys"
                :options="catelist"
                :props="cateProps"
                @change="getParamsData"></el-cascader>
            </el-row>

            <!-- tab页签区域 -->
              <el-tabs v-model="activeName" @tab-click="getParamsData">
                <el-tab-pane label="动态参数" name="many">
                    <el-button @click="addDialogVisible = true" type="primary" size="mini" :disabled="isBtnDisabled">添加参数</el-button>
                    <!-- 动态参数表格  slot-scope="scope"-->
                    <el-table :data="manyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button @click="addDialogVisible = true" type="primary" size="mini" :disabled="isBtnDisabled">添加属性</el-button>
                    <!-- 静态属性表格  slot-scope="scope"-->
                    <el-table :data="onlyTableData" border stripe>
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput"
                                size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template  slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                childre: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签名称
            activeName: 'many',
            // 动态参数数据
            manyTableData: [],
            // 静态属性数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            editDialogVisible: false,
            // 修改表单数据对象
            editForm:{},
            // 修改表单的验证规则
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur'}
                ]
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框中输入的内容
            inputValue: ''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories')
            if(res.meta.status !== 200){
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist = res.data
            console.log(this.catelist)
        },
        // 级联选择框选中项变化，会触发
        async handleChange() {
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick() {

        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
            this.getParamsData()
        },
        async getParamsData() {
            // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }

            // 根据所选分类的Id和当前所处的面板获取对应的参数
            const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`, 
                {
                    params: {sel: this.activeName}
                }
            )

            if(res.meta.status !== 200){
                return this.$message.error('获取参数列表失败')
            }
            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputVisible = ''
            })
            console.log(res.data)

            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        // 点击按钮添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false
                this.handleChange()
            })
        },
        // 点击按钮展示修改对话框
        async showEditDialog(attr_id){
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params: {attr_sel: this.activeName}
            })
            if(res.meta.status !== 200){
                this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 点击按钮修改参数信息
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据Id删除对应的参数项
        async removeParams(attr_id) {
            const confirmResult = await this.$confirm(
                '此操作将永久删除该文件, 是否继续?', '提示', 
                {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }
            ).catch(err => err)
            // 用户取消了删除操作
            if(confirmResult !== 'confirm'){
                return this.$message.info('已取消删除！')
            }
            // 删除的业务逻辑
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200){
                return this.$message.error('删除参数失败！')
            }
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点或按下ENTER键时触发
        async handleInputConfirm(row) {
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有return，则证明输入的内容需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求，保存此操作
            this.saveAttrVals(row)
        },
        // 点击按钮展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获取焦点
            // nextTick:当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClose(i, row){
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        },
        // 将对attr_vals的操作，保存到服务器
        async saveAttrVals(row){
            // 需要发起请求，保存此操作
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })

            if(res.meta.status !== 200){
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        }
    },
    computed: {
        // 如果按钮需要被禁用，则为true，否则为false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0;
    }

    .el-tag {
        margin: 10px;
    }

    .input-new-tag {
        width: 120px;
    }
</style>

